Geoege andrews



.(ModelQ) y G; ANDREWS.

DEVICE FOR ROUGHENING GBINDSTONES. l No.' 272,615. Patented Feb.2o,183.

WITNBssEs INVBNTOR.:

a z j Y MMX! A Y y ATTORNEYS.

N4 PErERS. Pnowulhognph. washington, D. C.

UNITED STATES PATENT Enron..

GEORGE ANDREWs,`OE RELLOWs EALLs, VERMONT.

DEVICE FOR -ROUGHENING GRINDSTONES.

SPECIFICATION forming part of Letters Patent No. 272,615, dated February 20, 1883.

Application tiled May 31, 1882. (Model.)

To all whom it may concern:

Be it known that I, GEORGE ANDREWS, of Bellows Falls, in the county ot' Windham and State of Vermont, have invented a. new and Improved Device for Roughening Grindstones, ot' which the following is a full, clear, and exact description.

My invention consists ot' a device Or machine for pecking grindstones 4for giving to the stone a new and sharp or ronghened surface. The device is more especially intended for grindstones used for grinding wood for making paper-pulp.

Reference is to be had tothe accompanying drawings, forming part ot' this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure l is a side elevation of a grindstone, showing my roughening device applied thereto; and Fig. 2 is a plan view ofthe device.

A represents a bladed internallyscrewthreaded wheel for ruiming in contact with the surface of the stone D l`or cutting` and pecking the same. The wheel is placed upon tlte screw-rod B, and is adaptedLwhen the rod and wheel are applied to the stone, to travel upon therod from one edge of the stone to the other, the wheel heilig revolved by the stone as the stone revolves.

rThe wheel and screw-rod may be applied to the stone in various ways. The means I prei'er to employ consists of the frame. C,adapted to be attached to the uprights b b ot' the frame of the grindstone, in which frame C the screwrod is hinged to swing vertically on inwardlyprojecting studs Z, passing through sleeves k on the ends of' rods a, as shown.

The frame C is composed of the rod d, bent to form the parallel arms e e, and of the handlef, attached to the rod d, for handling the device. The outer ends of the arms e e are formed with the sleeves t' i, in which are placed the sliding pins g g, which are adapted to enter suitable orilices made in the upper ends of the uprights b b for holding the frame in place.

h h are springsupportedlevers pivoted to the outside ofthe arms e e, for operating the sliding pins for attaching and detaching the device in position for use.

y In use the wheel A is to be turned until it reaches one end of the screw-rod B. The device is then to be attached to the uprights b b, as shown in Fig. 1, in which position the blades ofthe wheel A will rest in contact with [the grinding-surface of the stone.

As the stone revolves the wheel A will be turned upon the rod, which will cause it to gradually traverse the width of the stone, peckingand sharpening the stone as it goes. When the wheel shall have traversed the width ot' the stone the fraine C has simply to be detached and reversed, which will bring the wheel A again into position upon the saine side of the stone from whence it started for repeating the operation.

jj represent stop-plates secured to the arms c e, which serve to prevent the wheel and screw-rod getting out ot' position in the frame C while the device is being reversed-or when not in use.

The blades in the wheelA may be made straight across the periphery of the wheel or diagonally across, as found most expedient.

Having thus iully described my invention, what l claim as new, and desire to secure by Letters Patent, is

l. The frame consisting of the handle f, cross-piece d, side arms, c, and the inward projecting studsl thereon, in combination with the internally-screw-threaded wheel A on the screw-rod B, the arms a, fixed to said screw, and the sleeves 7s, secured to said arms c, and oscillating upon said studs l, as shown and described.

2. The frame C, provided with the sliding pins g g, and the spring-supported levers h It for operating the pins, in combination with the screw-rod B, arms a a, and the wheel A, substantially as described. V

3. The combination, with the roughcning Wheel A, provided with the screw B, arms a, and sleeves lc, of the handle or bail C d cf, provided with studs l, oi' the stop-plates j, secured to the bail or handle described beyond said stud l trom the handle G, as and for the purpose specitied.

4. The device for roughening griudstones, made substantially as herein shown and described, consisting of the screw-rod B and bladed wheel A, hinged iu the frame C, the said frame being provided with the stopsj, spring-supported levers h, and the sliding pins g, as set forth.

GEORGE ANDREWS.

Witnesses:

CHARLES E. HOWARD, ERNEST C. HOWARD.

IOC 

